Here is an updated list of Cubs post-2015 MLB Rule 5 Draft & MLB Rule 55 Minor League Free-Agent eligibles. (There are no Cubs minor league players eligible to be post-2015 Article XX-D free-agents at this time).
It is not an oversight that Willson Conteras is not on the list of Cubs 2015 Rule 5 Draft eligibles.
A player who is eligible to be a minor league free-agent post-2015 (like Willson Contreras) is eligible for selection in the December 2015 Rule 5 Draft only if the player signs a 2016 minor league contract or agrees to a minor league successor contract prior to the Rule 5 Draft.